Definition of dead letter in English:

dead letter

Syllabification: dead let·ter

noun

1chiefly North American A letter that is undeliverable and unreturnable, typically one with an incorrect address.
More example sentences
  • Apparently they are working at the U.S. Post Office, in the dead letter department.
2A law or treaty that has not been repealed but is ineffectual or defunct in practice.
More example sentences
  • Why should we develop the common law to make the statute a dead letter?
  • In many ways the law has become a dead letter in Israel.
  • Some people are of the opinion that the 1689 Bill of Rights is a dead letter, but the law will need to be changed in order for this to be so; and this may be a long and tedious process.
2.1A thing that is impractical or obsolete: theoretical reasoning is a dead letter to a child
More example sentences
  • Communism is a dead letter, and nobody wants a return to military dictatorship.
  • The socialist objective is a dead letter today, but remember, it was a liability for Labor for a long time.
  • Jurisprudence, learning, and religiosity were not dead letters.

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